Sexuality Confusion. Am i bisexual?!?

I just wanted to see what other people think cuz im pretty confused. My sister and brother always tease my about being lesbian (my whole family is really accepting and wouldnt care at all, they just like messing with me). My sister actualy does think i am. She dosent tell me directly but i can tell that jokingly saying it is her way of telling me what she thinks. I guess i should ask her why she thinks that.She used to hate people for being homophobic but recently she got a new boyfriend whos the kind of christian that dosent accept it and shes becoming that way also.

The reason why i think it might not just be a phase is because in my k-2nd grade years i used to have a close friend and randomly kiss her own the lips. Other friends would say eww. She never said anything but would look uncomfortable. I always just thought it was like a hug. When in the fourth and fifth grade my friends (girls) would always say i would geet too close for a long time too much. I would always put my arm around them and push them with my hips. Stuff like that. Is it just because i ve always felt lonely or am i just a physical person? Well it cant be that cuz i dont like anything alse physical like sports and such. i dont know.

Now im noticing girls more and more. Their faces, breasts. And if i like girls i know i have to be bi cuz i like guys too. I dont know when ill be able to figure this out either because everyone my age around has pretty boring personalities and right know its getting to be cool to say your bi if your a girl at my school even if you arent. Sorry bit i need to get these thoughts out.